[TUHS] SCCS, TeamWare, BitKeeper, and Git

[Tom Lyon]

Yeah, the big changes in SunOS 4.0 were all around mmap and shared
libraries.

But I did a tiny subset of mmap - for mapping device registers only - in
SunOS 2 (or 3?).  But I used the CSRG spec for mmap.

On Sun, Dec 15, 2024 at 12:25 PM Dan Cross <crossd at gmail.com> wrote:

> On Sun, Dec 15, 2024 at 2:12 PM Luther Johnson
> <luther.johnson at makerlisp.com> wrote:
> > I don't know where mmap showed up in vanilla BSD distributions, but it
> > was in SunOS 4.0, I used it.
>
> kern_mman.c shows up in 4.1c, but is behind an #ifdef; I gather it
> wasn't fully implemented. It was described in 4.2, as mentioned, but
> wasn't "fully functional" until Net/2 (according to mmap(2), anyway).
>
> Sun's version was an independent implementation.
>
> As mentioned by Chet, the interface is modeled after the PMAP call on
> TENEX/TOPS-20. The virtual memory system on TENEX, in turn, was at
> least partially influenced by Multics, so there is some Multics
> intellectual DNA (perhaps mutated :-)) in mmap(), though it's
> indirect.
>
>         - Dan C.
>
> > To the other points, the Multics
> > "one-level-store" idea was very powerful, and was an important influence
> > in Apollo Domain/OS, and it was probably there in Prime Computer's OS
> too.
> >
> > On 12/15/2024 12:02 PM, Chet Ramey via TUHS wrote:
> > > On 12/15/24 4:43 AM, G. Branden Robinson wrote:
> > >> At 2024-12-15T07:22:29+0000, Lars Brinkhoff wrote:
> > >
> > >> Maybe I would, in fact, hate using Multics.  But I can't forget that
> > >> well after Unix had fledged, its developers at CSRC found it necessary
> > >> and/or desirable to borrow back a Multics concept: they named it
> mmap().
> > >
> > > I think it was primarily inspired by TENEX/TOPS-20, and it was the CSRG
> > > who proposed it. The concepts are described in CSRG TR/4 and mmap()
> > > ended up described in the 4.2BSD manual, but not implemented.
> > >
> > > I don't think Reiser's VM system at the Labs included mmap(), but I
> think
> > > it did have something similar. Of course, that never really saw the
> light
> > > of day.
> > >
> >
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tuhs.org/pipermail/tuhs/attachments/20241215/a9c0abf6/attachment.htm>